United States Army


< to March • April 1862 • to May >

Commanded by Major General George B. McClellan

On April 4, 1862 General McClellan’s command was split, with the First Corps transferred to the newly-created Department of the Rappahannock and the Fifth Corps to the Department of the Shenandoah.

Headquarters

Guards & Orderlies
McClellan Dragoons (Illinois) from Cavalry Reserve
Sturgis (Illinois) Rifles
Oneida (New York) Cavalry Company
4th United States Cavalry, Cos. A & E
Provost Guard Colonel Andrew Porter
8th United States Infantry, Cos. F&G
Engineer Brigade Brigadier General Daniel Woodbury
15th New York Engineer Regiment
50th New York Engineer Regiment Colonel Charles B. Stuart
Regular Engineer Battalion
Siege Artillery
1st Connecticut Heavy Artillery
Infantry Reserve Brigadier General George Sykes
2nd United States Infantry Regiment
3rd United States Infantry, 6 Cos.
4th United States Infantry Regiment
6th United States Infantry Regiment
10th United States Infantry, 4 Cos. 
11th United States Infantry Regiment
12th United States Infantry Regiment
14th United States Infantry Regiment
17th United States Infantry, 4 Cos. 
5th New York Infantry Regiment

First Corps

Major General Irvin McDowell to Dept. Rappahannock 4/4
First Division Brigadier General Willliam B. Franklin
Second Division Brigadier General George A. McCall
Third Division Brigadier General Rufus King

Second Corps

Brigadier General Edwin V. Sumner
First Division Brigadier General Israel B. Richardson
Second Division Brigadier General John Sedgwick

Third Corps

Brigadier General Samuel P. Heintzelman
First Division Brigadier General Fitz John Porter
Second Division Brigadier General Joseph Hooker
Third Division Brigadier General C. Hamilton (to 4/30)
Brigadier General Philip Kearney

Fourth Corps

Brigadier General Erasmus Keyes
First Division Brigadier General Darius N. Couch
Second Division Brigadier General William F. Smith
Third Division Brigadier General Silas Casey

Fifth Corps

Major General Nathaniel Banks to Dept. Shenandoah 4/4
First Division Brigadier General Alpheus S. Williams
Second Division Brigadier General John Shields
Cavalry Command Brigadier General John P. Hatch

Cavalry Reserve

Brigadier General Philip St. George Cooke
First Brigade Colonel William H. Emory
5th United States Cavalry Regiment
6th United States Cavalry Regiment
6th Pennsylvania Cavalry Regiment Colonel Richard H. Rush
2nd Brigade Colonel George A.H. Blake
 1st United States Cavalry Regiment Lieutenant Colonel William N. Grier
 8th Pennsylvania Cavalry Regiment from 4 Corps
Unattached
4th Pennsylvania Cavalry Regiment Colonel David Campbell

Artillery Reserve

Colonel Henry J. Hunt
1st New York Artillery Bn., Battery A Captain Thomas H. Bates
1st New York Artillery Bn., Battery B  Captain Rufus T. Pettit
1st New York Artillery Bn., Battery C
1st New York Artillery Bn., Battery D  Captain Thomas W. Osborn
5th New York Independent Battery
1st United States Artillery, Battery E
1st United States Artillery, Batteries G&K
2nd United States Artillery, Battery A
2nd United States Artillery, Battery B
2nd United States Artillery, Battery E
2nd United States Artillery, Battery L
2nd United States Artillery, Battery M
3rd United States Artillery, Batteries C&G
3rd United States Artillery, Batteries F&K
3rd United States Artillery, Batteries L&M
4th United States Artillery, Battery G
4th United States Artillery, Battery K
5th United States Artillery, Battery A
5th United States Artillery, Battery I
5th United States Artillery, Battery K
5th United States Artillery, Battery M